an unknown quantity

He is an unknown quantity for his rivals.

对于对手们而言，他是个未知数。

In algebra, the sign X usually denotes an unknown quantity.

在代数里, 符号X常用来表示未知数.

John is a possibility for the job, but he is still an unknown quantity.

约翰可能获得这工作但(能否获得)现在还是个未知数.

The new sales director is still a bit of an unknown quantity.

新来的销售部主任大家还不大了解.

His ability to make decisions in a crisis is an unknown quantity.

他在危机中作决定的能力还是个未知数.

Garlic to me is an unknown quantity.

我从不吃大蒜.

Our new director is still an unknown quantity.

我们对新来的主管知之甚少.

What we would find if we could fly to the moon is an unknown quantity.

如果我们能飞到月球上去,在那里我们将会发现什么,这是很难以预料的.

I don't know what the new man will do; he's still an unknown quantity.

我不知道那个新来的会怎么做, 他的人怎样仍然是个未知数.

Debrecen were an unknown quantity and they played very defensively, which is their right.

赛前谁都不知道德布莱森的实力,他们也踢的很有侵略性, 这是他们正确的选择.